Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6e93ebd7ef89299…

MALICIOUS

PDF

70.6 KB Created: 2021-09-13 18:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1db28c42cd35b44a0868583ac44f7af4 SHA-1: afb9968ff25ad064e066765df78b0c9742d88564 SHA-256: e6e93ebd7ef89299048f4fc0cff509d4b63191cfc64ce75e9aeedf4f4434e81c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress sites. The presence of embedded JavaScript, flagged by heuristics, suggests potential for malicious scripting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/uplcv?utm_term=hill+climb+racing+2+unlock+everything PDF link annotation
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/0760c1bdb0484dbbd2adc049202d6b87/72382428668.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/16896564643.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/70969266016.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/0beddf0fd044aa0fa74329267032c656/vegakofuzutaw.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/48985073953.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/74713333785.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/16368133806.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/kuwililuxawutuwisojo.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/wenifep.pdfIn PDF document text
    • http://belniig.by/public/file/32777125488.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/maxoled.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139b18ea8f8d---30436879812.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/divaderere.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/dugisowogepenegagera.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1d3c2cc33---kuxokanaboxeborakun.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c97ac4cc09---17934311364.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/kazufig.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/43875005551.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/figixaseto.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/deritevow.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/riguvewopixi.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/nozoza.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/wasujibu.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/katidoko.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/68876248091.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/sukixugosajiv.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/lelizosowipadezotiju.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/vekazela.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF8 11132 bytes
SHA-256: e20241b02c41391710d86907fde8496a4c51d7b33198f9b9fc1f638701760ca7
font_02_sfnt_off0000e7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CC 14700 bytes
SHA-256: a1547e00b5868327988db4399ebf5eefc2df81e34d28b0dd4cbb02fca6e7cdcc

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